Working through AE2015, how do I turn back on the display of frames being rendered during the render process?
That is a feature that got disabled during the re-architecture. We will be re-enabling it as soon as possible. If you need that feature, then you can open the project in After Effects CC 2014 (13.2) and do final renders from there.
features not available in After Effects CC 2015 (13.5) | After Effects region of interest
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